Volcanic activity

This animation demonstrates different types of volcanic eruptions

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Folding (intermediate)

Lateral compressive forces cause rocks to form folds. This is how fold mountains are...

Karst region (basic)

Karst formations include dolines and dripstones.

Glacier (basic)

A glacier is a large body of ice that forms from snow, and is in constant, slow motion.

Coal formation

This video presents the different stages of coal formation.

Weather fronts

When masses of cold and warm air meet, weather fronts develop.


Short-lived but extremely powerful tornadoes can cause a great deal of damage.

Nitrogen cycle

Atmospherical nitrogen is bound by bacteria and used by living organisms in the form...

Ocean currents

The Great ocean conveyor is a planet-wide system of ocean currents, which has a great...

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